Tizen(Headed) Native API  6.5
Cairo GL

Cairo GL/Evas_GL APIs are official APIs for Tizen.

Required Header

#include <cairo-evas-gl.h>

Overview

In Tizen, Cairo provides gl backend in order to do hardware-accelerated rendering. Since the EGL is not public supported in Tizen, Cairo Evas_GL has been provided to user interfaces instead to allow indirect access to EGL layer.

Features :

  • Support a new cairo_device structure for interface to the underlying GL or EvasGL.
  • Support a new cairo_surface structure for representing GL or Evas_GL_Surface object that cairo can render to.
  • Get the underlying Evas_GL object used to create cairo device object.
  • Get the underlying Evas_GL_Context object used to create cairo device object.

Remarks :

  • Cairo GL and Cairo Evas_GL will use an GL/Evas_GL context and API set.
  • Therefore, Evas_GL and OpenGL-ES should be provided for normal operation of Cairo gl backend.

Functions

cairo_public cairo_surface_t * cairo_gl_surface_create (cairo_device_t *device, cairo_content_t content, int width, int height)
 Create a cairo GL surface using the device as the underlying rendering system.
cairo_public cairo_surface_t * cairo_gl_surface_create_for_texture (cairo_device_t *abstract_device, cairo_content_t content, unsigned int tex, int width, int height)
 Create a cairo GL surface using the texture as the render target, and the device as the underlying rendering system.
The content must match the format of the texture
CAIRO_CONTENT_ALPHA <-> GL_ALPHA
CAIRO_CONTENT_COLOR <-> GL_RGB/GL_BGR
CAIRO_CONTENT_COLOR_ALPHA <-> GL_RGBA/GL_BGRA
.
cairo_public int cairo_gl_surface_get_width (cairo_surface_t *abstract_surface)
 Returns the width of given cairo surface object.
cairo_public int cairo_gl_surface_get_height (cairo_surface_t *abstract_surface)
 Returns the height of given cairo surface object.
cairo_public void cairo_gl_device_set_thread_aware (cairo_device_t *device, cairo_bool_t thread_aware)
 Cairo can be used in multithreaded environment.
By default, cairo switches out the current GL context after each draw finishes.
This API tells cairo not to switch GL context if no other thread uses cairo for rendering.
In carefully designed application, there should be a single, dedicated rendering thread.
.
cairo_public cairo_device_t * cairo_evas_gl_device_create (Evas_GL *evas_gl, Evas_GL_Context *evas_context)
 Creates and returns a new cairo_device structure for interface to underlying rendering system.
cairo_public cairo_surface_t * cairo_gl_surface_create_for_evas_gl (cairo_device_t *device, Evas_GL_Surface *evas_surface, Evas_GL_Config *evas_config, int width, int height)
 Creates and returns a new cairo_surface structure for representing Evas_GL_Surface object that cairo can render to.
cairo_public Evas_GLcairo_evas_gl_device_get_gl (cairo_device_t *device)
 Returns the underlying Evas_GL object used to create cairo device object.
cairo_public Evas_GL_Contextcairo_evas_gl_device_get_context (cairo_device_t *device)
 Returns the underlying Evas_GL_Context object used to create cairo device object.

Function Documentation

cairo_public cairo_device_t* cairo_evas_gl_device_create ( Evas_GL evas_gl,
Evas_GL_Context evas_context 
)

Creates and returns a new cairo_device structure for interface to underlying rendering system.

Since :
2.3.1
Parameters:
[in]evas_glThe given Evas_gl object
[in]evas_contextThe given Evas GL Context object
Returns:
The created cairo_device structure, or an error status on failure. The error value can be retrieved with cairo_device_status().
See also:
evas_gl_new
evas_gl_context_create
cairo_gl_surface_create_for_evas_gl
cairo_public Evas_GL_Context* cairo_evas_gl_device_get_context ( cairo_device_t *  device)

Returns the underlying Evas_GL_Context object used to create cairo device object.

Since :
2.3.1
Parameters:
[in]deviceThe given cairo_device_t represents the driver interface to underlying rendering system
Returns:
The created Evas_GL_Context object or NULL on failure The error value on failure can be retrieved with cairo_status().
cairo_public Evas_GL* cairo_evas_gl_device_get_gl ( cairo_device_t *  device)

Returns the underlying Evas_GL object used to create cairo device object.

Since :
2.3.1
Parameters:
[in]deviceThe given cairo_device_t represents the driver interface to underlying rendering system
Returns:
The created Evas_GL object or NULL on failure The error value on failure can be retrieved with cairo_status().
cairo_public void cairo_gl_device_set_thread_aware ( cairo_device_t *  device,
cairo_bool_t  thread_aware 
)

Cairo can be used in multithreaded environment.
By default, cairo switches out the current GL context after each draw finishes.
This API tells cairo not to switch GL context if no other thread uses cairo for rendering.
In carefully designed application, there should be a single, dedicated rendering thread.
.

Since :
2.3.1
Parameters:
[in]deviceThe given cairo_device structure for the interface to underlying rendering system
[in]thread_awareSet this value as FALSE to choose non-thread-aware mode
cairo_public cairo_surface_t* cairo_gl_surface_create ( cairo_device_t *  device,
cairo_content_t  content,
int  width,
int  height 
)

Create a cairo GL surface using the device as the underlying rendering system.

Since :
2.3.1
Parameters:
[in]deviceThe given cairo_device_t represents the driver interface to underlying rendering system
[in]contentType of content in the surface
[in]widthWidth of the surface, in pixels
[in]heightHeight of the surface, in pixels
Returns:
The created surface or NULL on failure The error value on failure can be retrieved with cairo_status().
cairo_public cairo_surface_t* cairo_gl_surface_create_for_evas_gl ( cairo_device_t *  device,
Evas_GL_Surface evas_surface,
Evas_GL_Config evas_config,
int  width,
int  height 
)

Creates and returns a new cairo_surface structure for representing Evas_GL_Surface object that cairo can render to.

Since :
2.3.1
Parameters:
[in]deviceThe given cairo_device structure for the interface to underlying rendering system
[in]evas_surfaceThe given Evas_GL_Surface object for GL Rendering
[in]evas_configThe pixel format and configuration of the rendering surface
[in]widthThe width of the surface
[in]heightThe height of the surface
Returns:
The created cairo_surface structure, or an error status on failure The error value can be retrieved with cairo_surface_status().
See also:
cairo_evas_gl_device_create
evas_gl_surface_create
evas_gl_config_new
cairo_public cairo_surface_t* cairo_gl_surface_create_for_texture ( cairo_device_t *  abstract_device,
cairo_content_t  content,
unsigned int  tex,
int  width,
int  height 
)

Create a cairo GL surface using the texture as the render target, and the device as the underlying rendering system.
The content must match the format of the texture
CAIRO_CONTENT_ALPHA <-> GL_ALPHA
CAIRO_CONTENT_COLOR <-> GL_RGB/GL_BGR
CAIRO_CONTENT_COLOR_ALPHA <-> GL_RGBA/GL_BGRA
.

Since :
2.3.1
Parameters:
[in]abstract_deviceThe given cairo_device_t represents the driver interface to underlying rendering system
[in]contentType of content in the surface
[in]texName of texture to use for storage of surface pixels
[in]widthWidth of the surface, in pixels
[in]heightHeight of the surface, in pixels
Returns:
The created surface or NULL on failure The error value on failure can be retrieved with cairo_status().
cairo_public int cairo_gl_surface_get_height ( cairo_surface_t *  abstract_surface)

Returns the height of given cairo surface object.

Since :
2.3.1
Parameters:
[in]abstract_surfaceThe given cairo_surface_t object
Returns:
the surface height or NULL on failure The error value on failure can be retrieved with cairo_status().
cairo_public int cairo_gl_surface_get_width ( cairo_surface_t *  abstract_surface)

Returns the width of given cairo surface object.

Since :
2.3.1
Parameters:
[in]abstract_surfaceThe given cairo_surface_t object
Returns:
the surface width or NULL on failure The error value on failure can be retrieved with cairo_status().